$NetBSD$

Do not override CFLAGS.

--- src/enet/Makefile.orig	2014-05-11 18:42:17.000000000 +0000
+++ src/enet/Makefile
@@ -1,4 +1,3 @@
-CFLAGS=-O3 -fomit-frame-pointer
 override CFLAGS:= $(CFLAGS) -Iinclude $(shell ./check_cflags.sh $(CC) $(CFLAGS))
 
 OBJS= \
